13123908197 has 4 divisors (see below), whose sum is σ = 13140886860. Its totient is φ = 13106929536.

The previous prime is 13123908191. The next prime is 13123908199. The reversal of 13123908197 is 79180932131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 237344836 + 12886563361 = 15406^2 + 113519^2 .

It is a cyclic number.

It is not a de Polignac number, because 13123908197 - 2²⁰ = 13122859621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13123908191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8488172 + ... + 8489717.

It is an arithmetic number, because the mean of its divisors is an integer number (3285221715).

Almost surely, 2^13123908197 is an apocalyptic number.

It is an amenable number.

13123908197 is a deficient number, since it is larger than the sum of its proper divisors (16978663).

13123908197 is an equidigital number, since it uses as much as digits as its factorization.

13123908197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16978662.

The product of its (nonzero) digits is 81648, while the sum is 44.

The spelling of 13123908197 in words is "thirteen billion, one hundred twenty-three million, nine hundred eight thousand, one hundred ninety-seven".